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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2daa84a27902439d9fccead9384794d6c824662cd0a883dedf90ae4cc0efd56' 
  AND token = 'SXrC4QLFMhQu5nnqXh3OmGuPmoj1lQxESErAfGnM3pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}